398 THE CHICAGO ACADEMY OF SCIENCES. 



nasoni, but that species is larger, has a more regularly globose shell, 

 a longer spire and broader inner lip which emargins the umbilical 

 chink. Nasoni belongs to the catascopium group, while apicina is a 

 member of the emarginata group. 



The species is named in honor of Dr. William A. Nason, of 

 Alongquin, Illinois, who collected the specimens. 



Galba woodruffi (Baker). Plate XLII, figures 18-22. 



Limncea catascopium pinguis Baker (non Say), Trans. Acad. Sci., St. 

 Louis, XI, p. 5, pi. 1, fig. 12, 1901. 



Limncea zvoodriM Baker, Bull. Chi. Acad. Sci., II, p. 229, fig. 1901; Moll. 

 Chi. Area, II, p. 264, pi. 31, fig. 8, 1902. — Blatchley & Daniels, An. Rep. Dept. 

 Geol. & Nat. Res., Ind., XXVII, p. 598, pi. 1, fig. 16, 1902.— Daniels, 1. c, 

 p. 636, 1902.— Ckll., Nautilus, XVI, p. 96, 1902. 



Lymncea woodruM Baker, Bull. 111. State Lab. N. H., VII, p. 104, 1906. 



Shell : Small, ventricose, inflated, rather solid ; periostracum 

 greenish-horn or olivaceous ; surface shining, growth lines crowded, 

 very distinct, crossed by fine impressed spiral lines ; nuclear whorls 

 roundly inflated, light or dark horn colored similar in outline to those 

 of jacksonensis ; whorls 4-4^2, convex, tumid, the body whorl very large, 

 occupying more than two-thirds the length of the shell ; spire generally 

 much depressed, globose ; sutures well impressed ; aperture very large, 

 long-ovate to roundly ovate, broadly rounded below, angulated above, 

 occupying about two- thirds the total length of the shell ; it is some- 

 times shouldered ; outer lip thickened within by a heavy longitudinal va- 

 rix ; inner lip rather wide, with parallel margins, spreading over the um- 

 bilicus which it slightly emargins and forming a wide, flattened ex- 

 pansion ; an umbilical chink is usually present ; the callus on the parietal 

 wall is thick and heavy and is the same width as the inner lip; in 

 some specimens the columella is thickened in the middle forming a 

 distinct tubercle ; a columellar plait is not developed, but the axis, 

 especially in the upper whorls, is distinctly twisted. 



Length. 



Width. 



Aperture len 



gth. Width. 





11.80 



8.50 



8.50 



5.50 mill. 



Type. 



10.50 



7.25 



8.50 



4.75 " 



" 



10.50 



7.00 



8.00 



5.00 " 



" 



9.00 



5.25 



6.00 



3.50 " 



Millers. 



9.50 



6.00 



6.75 



3.50 " 



" 



13.75 



8.00 



9.50 



4.50 " 



Chicago. 



11.50 



7.50 



8.25 



4.25 " 



" 



Types : Five 



specimens, Chicago Academy of 



Sciences, 23 r 



and 3425. 











Type Locality : Lake 



Michigan, 



Oak Street, Chicago, Illinois. 



Animal, Jaw, 



Radula and Gen 



italia : Unknc 



wn. 



